/* FileSaver.js
 * A saveAs() FileSaver implementation.
 * 1.1.20151003
 *
 * By Eli Grey, http://eligrey.com
 * License: MIT
 *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
 */

/*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */

/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */

var saveAs = saveAs || (function(view) {
    "use strict";
    // IE <10 is explicitly unsupported
    if (typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {
      return;
    }
    var
      doc = view.document
    // only get URL when necessary in case Blob.js hasn't overridden it yet
      , get_URL = function() {
        return view.URL || view.webkitURL || view;
      }
      , save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
      , can_use_save_link = "download" in save_link
      , click = function(node) {
        var event = new MouseEvent("click");
        node.dispatchEvent(event);
      }
      , is_safari = /Version\/[\d\.]+.*Safari/.test(navigator.userAgent)
      , webkit_req_fs = view.webkitRequestFileSystem
      , req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
      , throw_outside = function(ex) {
        (view.setImmediate || view.setTimeout)(function() {
          throw ex;
        }, 0);
      }
      , force_saveable_type = "application/octet-stream"
      , fs_min_size = 0
    // See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
    // https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
    // for the reasoning behind the timeout and revocation flow
      , arbitrary_revoke_timeout = 500 // in ms
      , revoke = function(file) {
        var revoker = function() {
          if (typeof file === "string") { // file is an object URL
            get_URL().revokeObjectURL(file);
          } else { // file is a File
            file.remove();
          }
        };
        if (view.chrome) {
          revoker();
        } else {
          setTimeout(revoker, arbitrary_revoke_timeout);
        }
      }
      , dispatch = function(filesaver, event_types, event) {
        event_types = [].concat(event_types);
        var i = event_types.length;
        while (i--) {
          var listener = filesaver["on" + event_types[i]];
          if (typeof listener === "function") {
            try {
              listener.call(filesaver, event || filesaver);
            } catch (ex) {
              throw_outside(ex);
            }
          }
        }
      }
      , auto_bom = function(blob) {
        // prepend BOM for UTF-8 XML and text/* types (including HTML)
        if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
          return new Blob(["\ufeff", blob], {type: blob.type});
        }
        return blob;
      }
      , FileSaver = function(blob, name, no_auto_bom) {
        if (!no_auto_bom) {
          blob = auto_bom(blob);
        }
        // First try a.download, then web filesystem, then object URLs
        var
          filesaver = this
          , type = blob.type
          , blob_changed = false
          , object_url
          , target_view
          , dispatch_all = function() {
            dispatch(filesaver, "writestart progress write writeend".split(" "));
          }
        // on any filesys errors revert to saving with object URLs
          , fs_error = function() {
            if (target_view && is_safari && typeof FileReader !== "undefined") {
              // Safari doesn't allow downloading of blob urls
              var reader = new FileReader();
              reader.onloadend = function() {
                var base64Data = reader.result;
                target_view.location.href = "data:attachment/file" + base64Data.slice(base64Data.search(/[,;]/));
                filesaver.readyState = filesaver.DONE;
                dispatch_all();
              };
              reader.readAsDataURL(blob);
              filesaver.readyState = filesaver.INIT;
              return;
            }
            // don't create more object URLs than needed
            if (blob_changed || !object_url) {
              object_url = get_URL().createObjectURL(blob);
            }
            if (target_view) {
              target_view.location.href = object_url;
            } else {
              var new_tab = view.open(object_url, "_blank");
              if (new_tab == undefined && is_safari) {
                //Apple do not allow window.open, see http://bit.ly/1kZffRI
                view.location.href = object_url
              }
            }
            filesaver.readyState = filesaver.DONE;
            dispatch_all();
            revoke(object_url);
          }
          , abortable = function(func) {
            return function() {
              if (filesaver.readyState !== filesaver.DONE) {
                return func.apply(this, arguments);
              }
            };
          }
          , create_if_not_found = {create: true, exclusive: false}
          , slice
          ;
        filesaver.readyState = filesaver.INIT;
        if (!name) {
          name = "download";
        }
        if (can_use_save_link) {
          object_url = get_URL().createObjectURL(blob);
          save_link.href = object_url;
          save_link.download = name;
          setTimeout(function() {
            click(save_link);
            dispatch_all();
            revoke(object_url);
            filesaver.readyState = filesaver.DONE;
          });
          return;
        }
        // Object and web filesystem URLs have a problem saving in Google Chrome when
        // viewed in a tab, so I force save with application/octet-stream
        // http://code.google.com/p/chromium/issues/detail?id=91158
        // Update: Google errantly closed 91158, I submitted it again:
        // https://code.google.com/p/chromium/issues/detail?id=389642
        if (view.chrome && type && type !== force_saveable_type) {
          slice = blob.slice || blob.webkitSlice;
          blob = slice.call(blob, 0, blob.size, force_saveable_type);
          blob_changed = true;
        }
        // Since I can't be sure that the guessed media type will trigger a download
        // in WebKit, I append .download to the filename.
        // https://bugs.webkit.org/show_bug.cgi?id=65440
        if (webkit_req_fs && name !== "download") {
          name += ".download";
        }
        if (type === force_saveable_type || webkit_req_fs) {
          target_view = view;
        }
        if (!req_fs) {
          fs_error();
          return;
        }
        fs_min_size += blob.size;
        req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
          fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
            var save = function() {
              dir.getFile(name, create_if_not_found, abortable(function(file) {
                file.createWriter(abortable(function(writer) {
                  writer.onwriteend = function(event) {
                    target_view.location.href = file.toURL();
                    filesaver.readyState = filesaver.DONE;
                    dispatch(filesaver, "writeend", event);
                    revoke(file);
                  };
                  writer.onerror = function() {
                    var error = writer.error;
                    if (error.code !== error.ABORT_ERR) {
                      fs_error();
                    }
                  };
                  "writestart progress write abort".split(" ").forEach(function(event) {
                    writer["on" + event] = filesaver["on" + event];
                  });
                  writer.write(blob);
                  filesaver.abort = function() {
                    writer.abort();
                    filesaver.readyState = filesaver.DONE;
                  };
                  filesaver.readyState = filesaver.WRITING;
                }), fs_error);
              }), fs_error);
            };
            dir.getFile(name, {create: false}, abortable(function(file) {
              // delete file if it already exists
              file.remove();
              save();
            }), abortable(function(ex) {
              if (ex.code === ex.NOT_FOUND_ERR) {
                save();
              } else {
                fs_error();
              }
            }));
          }), fs_error);
        }), fs_error);
      }
      , FS_proto = FileSaver.prototype
      , saveAs = function(blob, name, no_auto_bom) {
        return new FileSaver(blob, name, no_auto_bom);
      }
      ;
    // IE 10+ (native saveAs)
    if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {
      return function(blob, name, no_auto_bom) {
        if (!no_auto_bom) {
          blob = auto_bom(blob);
        }
        return navigator.msSaveOrOpenBlob(blob, name || "download");
      };
    }

    FS_proto.abort = function() {
      var filesaver = this;
      filesaver.readyState = filesaver.DONE;
      dispatch(filesaver, "abort");
    };
    FS_proto.readyState = FS_proto.INIT = 0;
    FS_proto.WRITING = 1;
    FS_proto.DONE = 2;

    FS_proto.error =
      FS_proto.onwritestart =
        FS_proto.onprogress =
          FS_proto.onwrite =
            FS_proto.onabort =
              FS_proto.onerror =
                FS_proto.onwriteend =
                  null;

    return saveAs;
  }(
    typeof self !== "undefined" && self
    || typeof window !== "undefined" && window
    || this.content
  ));
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the window

if (typeof module !== "undefined" && module.exports) {
  module.exports.saveAs = saveAs;
} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
  define([], function() {
    return saveAs;
  });
}
